[[1]}]
There exists a constant \(\tilde{L}\ge \tilde{\mu }\)  such that for all \(x,y \in \subseteq ^d\) , where \(:=\lbrace x \in ^d : f(x)\le f(x_0)\rbrace \) :
\(f(x) \le f(y) + {\nabla f(y),x} + \frac{\tilde{L}}{2}{x-y}_{(y)}\) 
